/*
 * Copyright 2021 Rikai authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ai.eto.rikai.sql.spark.datasources

import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.catalyst.StructFilters
import org.apache.spark.sql.connector.read.{Scan, SupportsPushDownFilters}
import org.apache.spark.sql.execution.datasources.PartitioningAwareFileIndex
import org.apache.spark.sql.execution.datasources.v2.FileScanBuilder
import org.apache.spark.sql.sources.Filter
import org.apache.spark.sql.types.StructType
import org.apache.spark.sql.util.CaseInsensitiveStringMap

case class VideoScanBuilder(
    sparkSession: SparkSession,
    fileIndex: PartitioningAwareFileIndex,
    schema: StructType,
    dataSchema: StructType,
    options: CaseInsensitiveStringMap
) extends FileScanBuilder(sparkSession, fileIndex, dataSchema)
    with SupportsPushDownFilters {
  override def build(): Scan = VideoScan(
    sparkSession,
    fileIndex,
    dataSchema,
    readDataSchema(),
    readPartitionSchema(),
    options,
    pushedFilters()
  )

  private var _pushedFilters: Array[Filter] = Array.empty

  override def pushFilters(filters: Array[Filter]): Array[Filter] = {
    _pushedFilters = StructFilters.pushedFilters(filters, dataSchema)
    filters
  }

  override def pushedFilters(): Array[Filter] = _pushedFilters
}
